Not sure if this is relevent to your primed cases but felt the need to imput. I recently found a lost 40cal clip that I had placed in a plastic baggie. The bullets and cases were all corroded from the moisture the plastic bags collected. I have primed cases and left them for long periods of time before reloading them but have always kept them in a cardboard box. Not sure how your primers will react to the moisture buildup in plastic bags.